GPT-5.2 vs GPT-5.5 Pro
GPT-5.2 Verdict
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 62.0.
- GPT-5.2 (xhigh) is stronger in agents & tools, coding, composite, instruction following, knowledge, long context.
- GPT-5.5 Pro (xhigh) is stronger in maths, reasoning.
- GPT-5.2 (xhigh) is 14× cheaper ($4.81 vs $67.50 per 1M blended).
- GPT-5.2 (xhigh) streams 16.8× faster (67 vs 4 tokens per second).
| Metric | GPT-5.2 (xhigh) | GPT-5.5 Pro (xhigh) |
|---|---|---|
| BenchLeader Index | 62.0 | 67.1 |
| Agents & tools score | 56.4 | – |
| Coding score | 63.2 | – |
| Composite score | 67.6 | – |
| Instruction following score | 73.4 | – |
| Knowledge score | 57.9 | – |
| Long context score | 67.8 | – |
| Maths score | 58.4 | 74.5 |
| Reasoning score | 62.8 | 80.1 |
| Blended price $/M | $4.81 | $67.50 |
| Output speed | 67 tok/s | 4 tok/s |
| Time to first answer | 94.0 s | 3.5 s |
| Context window | 400k | 1.1M |
| GPQA Diamond | 91.4% | – |
| FrontierMath Tiers 1–3 | 67.4% | 87.7% |
| FrontierMath Tier 4 | 31.7% | 78.0% |
| OTIS Mock AIME | 96.1% | – |
| SimpleQA Verified | 37.1% | – |
| WeirdML | 72.2% | – |
| APEX-Agents | 34.4% | – |
| ProofBench | 15.0% | – |
| AA Intelligence Index | 30.4 | – |
| IFBench | 75.4% | – |
| AA-LCR | 82.7% | – |
| AA-Omniscience | -0.9 | – |
| Terminal-Bench Hard | 47.0% | – |
| GPQA Diamond (AA) | 90.3% | – |
| Humanity's Last Exam (AA) | 37.7% | – |
| τ²-Bench Telecom (AA) | 84.8% | – |
| AIME (Vals) | 96.9% | – |
| LiveCodeBench | 85.4% | – |
| MMLU-Pro | 86.2% | – |
| LegalBench | 82.8% | – |
| CorpFin | 65.9% | – |
| TaxEval | 75.8% | – |
| MedQA | 94.1% | – |
| MGSM | 94.0% | – |
| SWE-bench (Vals) | 75.8% | – |
| GPQA Diamond (Vals) | 91.7% | – |
| MCP Atlas | 67.6% | – |
| ARC-AGI-1 | 86.2% | 95.0% |
| ARC-AGI-2 | 52.9% | 84.2% |
| CritPt | 11.6% | 30.6% |
| CaseLaw v2 | 66.0% | – |
| MedCode | 49.8% | – |
| MedScribe | 84.4% | – |
| MMMU-Pro (Vals) | 86.7% | – |
| MortgageTax | 67.1% | – |
| SAGE | 49.3% | – |
| Vibe Code Bench v1.1 | 53.5% | – |
| DrugDiscoveryBench | 29.3% | – |
| Chess Puzzles | 49.0% | – |
| EBR-bench | 23.0% | – |
| VPCT | 84.0% | – |
| LMCA | 43.9% | 53.9% |
| DTBench | 90.9% | 96.0% |
Data as of 2026-09-19. Best configuration of each model; every score links to its source on the model pages.
GPT-5.2 vs GPT-5.5 Pro: questions
- Is GPT-5.2 better than GPT-5.5 Pro?
- GPT-5.5 Pro (xhigh) leads on quality: 67.1 vs 62.0. The BenchLeader Index combines every independent quality benchmark; GPT-5.5 Pro (xhigh) is ahead overall as of 2026-09-19, but check the category scores for your use.
- Which is cheaper, GPT-5.2 or GPT-5.5 Pro?
- GPT-5.2 is cheaper: $4.81 against $67.50 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.2 or GPT-5.5 Pro?
- GPT-5.2 streams faster: 67 against 4 output tokens per second.
- Which has the larger context window?
- GPT-5.5 Pro accepts more context: 1.1M against 400k tokens.